ios_memory_limit.c

#import <mach/mach_host.h>

int get_platform_memory_limit()
{
    mach_port_t host_port;
    mach_msg_type_number_t host_size;
    vm_size_t pagesize;
    
    host_port = mach_host_self();
    host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
    host_page_size(host_port, &pagesize);
    
    vm_statistics_data_t vm_stat;
    
    if (host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size) != KERN_SUCCESS) {
        return 50000000; // Default: 50 MB (This is a fairly safe value across current iOS devices)
    } else {
        natural_t mem_used = (vm_stat.active_count +
                              vm_stat.inactive_count +
                              vm_stat.wire_count) * pagesize;
        natural_t mem_free = vm_stat.free_count * pagesize;
        natural_t mem_total = mem_used + mem_free;
        
        // Return 10% of total memory (bytes)
        return (int)mem_total / 10;
    }
}